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arXiv · 1909.08325

Observation of a C-type short range antiferromagnetic order in expanded FeS

Meng Wang·Ming Yi·Benjamin A. Frandsen·Junjie Yin·Hualei Sun·Zhijun Xu·Huibo Cao·Edith Bourret-Courchesne·Jeffrey W. Lynn·Robert J. Birgeneau
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Abstract

We report neutron diffraction studies of FeS single crystals obtained from Rb$_x$Fe$_{2-y}$S$_2$ single crystals via a hydrothermal method. While no $\sqrt {5}\times \sqrt {5}$ iron vacancy order or block antiferromagnetic order typical of Rb$_x$Fe$_{2-y}$S$_2$ is found in our samples, we observe $C$-type short range antiferromagnetic order with moments pointed along the $c$-axis hosted by a new phase of FeS with an expanded inter-layer spacing. The N\'{e}el temperature for this magnetic order is determined to be 165 K. Our finding of a variant FeS structure hosting this $C$-type antiferromagnetic order demonstrates that the known FeS phase synthesized in this method is in the vicinity of a magnetically ordered ground state, providing insights into understanding a variety of phenomena observed in FeS and the related FeSe$_{1-x}$S$_x$ iron chalcogenide system.

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Meng Wang, Ming Yi, Benjamin A. Frandsen, Junjie Yin, Hualei Sun, Zhijun Xu, Huibo Cao, Edith Bourret-Courchesne, Jeffrey W. Lynn, Robert J. Birgeneau. 2019-09-18. Observation of a C-type short range antiferromagnetic order in expanded FeS. https://doi.org/10.1103/physrevmaterials.4.034802

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